JP3994118B2 - Filtration device capable of disassembly and cleaning - Google Patents

Description

  The present invention relates to a filter device capable of being decomposed and cleaned. Specifically, the present invention relates to a filtration device that can be cleaned for each member by removing main members constituting the filtration device.

There is a filter screen member as a main member constituting the filter device. As a conventional example of the filter screen member, there is a shape in which two screens face each other. A plurality of plate-like ribs are fixed between the two screens by welding. Each rib is bridged between both screens in a state of standing in the flow direction of the filtrate (see Patent Document 1).
According to this filter screen member, the ribs support both screens arranged opposite to each other from the inside. For this reason, the intensity | strength of the filtration screen member with respect to the indentation pressure at the time of a filtrate passing improves.
JP 2001-212406 A

However, the above-described filtration device using the filtration screen member has a problem that it takes time and labor to clean the filtration device.
That is, it is necessary to wash the filtration device after the filtration operation is completed. Particularly in the pharmaceutical manufacturing process, the filtration device must be more thoroughly cleaned due to lot management and legal restrictions. However, since the screens are fixed with ribs as described above, it takes time and effort to clean the portion sandwiched between the screens.
In addition, as a conventional example of a filtration device that feeds undiluted solution between a filter plate (filter screen member) with a filter material and the filter plate, and filters with the indentation pressure, two opposing filter media are placed between the square filter plates. There is something that was pinched. The filter medium is pressed against the rectangular filter plate by a ring-shaped packing (seal member) arranged outside (Japanese Patent Laid-Open No. 2004-57921). However, the above-described filtration apparatus has a problem that the filtrate that permeates the filter medium and leaks out. In particular, when the thickness of the filter medium was large, leakage of the filtrate was significant.
The present invention has been devised in view of the above points. That is, the problem to be solved by the present invention is to facilitate the cleaning of the filtration device itself by preventing the leakage of the filtrate during filtration as much as possible and disassembling the main components of the filtration device.

In order to solve the above problems, each invention of the present invention takes the following means.
First, a filter device capable of being disassembled and cleaned according to a first aspect of the present invention is a filter screen member comprising two filter screen members spaced apart in a chamber defined and sealed by a cylindrical frame member. The inside between the two is formed as a filtrate side chamber, and the outside between the filter screen members is defined as a stock solution side chamber. The frame member is supplied with a stock solution inlet for supplying the filtrate stock solution to the stock solution side chamber and the filtrate in the filtrate side chamber. Filtrate in which the outlet of the filtrate is provided and the end of the filtration screen member is attached, and the filtrate stock solution supplied to the stock solution side chamber is filtered by the filter screen member and the filtrate is taken out to the filtrate side chamber A rib is provided between the two filter screen members forming the filtrate side chamber, and the two filter screen members forming the filtrate side chamber are the same. Has been assembled to the frame member as a decomposition state from the frame member respectively independently are a washable independently upon degradation, the frame member, the outer periphery defines the outer periphery of the stock side chamber filtration It is comprised by the frame member and the outer periphery ring member which demarcates the outer periphery of a filtrate side chamber, and either one of an outer periphery filter frame member or an outer periphery ring member is the edge part of the filtration material which covers the filtration surface of a filter screen member And a flange portion formed so as to protrude in the longitudinal direction of the cylindrical shape with respect to the thickness of the disposed filtering material, and the other is a first portion from the longitudinal direction of the cylindrical shape. This is a configuration having a second part that presses the filtering material against the part, and a flange contact part that comes into contact with the flange part from the radial direction of the cylindrical shape via a seal member .

In the first aspect of the invention, the filtrate side chamber is formed by assembling two filter screen members, which can be disassembled independently from the frame member, to the frame member. For this reason, when the filtration device is disassembled and washed after the filtration operation, each filtration screen member can be removed and washed for each filtration screen member.
Next, ribs are disposed between the filtration screen members in a bridged state (bridged), and each filtration screen member is supported and reinforced by the ribs from the filtrate side chamber side. For this reason, it suppresses that the filtration screen member which opposes bends and deform | transforms in the direction which mutually approaches by the pushing pressure of filtrate.
Furthermore, in 1st invention, it has the flange part and flange contact part which were extended and formed in the length direction of the cylinder shape rather than the thickness of the filter medium, and the cylindrical radial direction of this flange part and flange contact part The seal member was interposed at the opposite location of the formation. For this reason, even if the thickness of the filter medium increases, the sealing performance of the frame member can be ensured.
The stock solution side chamber is provided with a stock solution inlet for supplying a filtrate stock solution (hereinafter referred to as stock solution or slurry), and the filtrate side chamber is provided with a filtrate outlet for discharging the filtrate (hereinafter referred to as filtrate). It has been.

  The filter device capable of being decomposed and washed according to the present invention is intended for solid-liquid separation of slurry. That is, both the solid (hereinafter referred to as cake) in the slurry and the filtrate can be used for recovery purposes. For example, pharmaceutical slurries containing medicinal ingredients, liquid food slurries such as liquor, wine, slurries containing pigments, dyes, gypsum, aluminum hydroxide, graphite, titanium compounds, paper pulp, fiber, pulp A pulp-based slurry such as a slurry can be the subject of the filtration operation.

Next, a filter device capable of being disassembled and cleaned according to the second invention is a filter device capable of being disassembled and cleaned according to the first invention, and the two filter screen members and the ribs are assembled as independent members that can be disassembled. It is made possible.
In the second invention, the filtrate side chamber is formed by assembling two filtration screen members and ribs, which can be disassembled independently from the frame member, to the frame member. For this reason, the filtration device can be disassembled into a state in which cleaning is easier.

Next, the filter device capable of being disassembled and cleaned according to the third invention is the filter device capable of being disassembled and cleaned according to the first invention or the second invention, wherein the ribs are a plurality of plate-like members that divide the filtrate side chamber. The ribs of the plate-like member are formed with communication passages that communicate the separated chambers.
In 3rd invention, the filtrate side chamber is divided | segmented by the rib which is a some plate-shaped member. Each rib is formed with a communication path that communicates the separated chambers.

Next, a filter device capable of being decomposed and cleaned according to a fourth invention is a filter device capable of being decomposed and cleaned according to any one of the first invention to the third invention , wherein the outer peripheral filter frame member is provided with a stock solution inlet. And a filtrate outlet is provided in the outer ring member.
In the fourth aspect of the invention, the outer circumferential濾枠member is provided stock inlet, the filtrate outlet is provided on the outer peripheral ring member.

Then the fifth decomposition washable filtering device aspect of the present invention, the first invention is an exploded washable filtering device according to any one of the fourth invention, the flange portion and the flange abutting site, The opposing locations in the radial direction of the cylindrical shape are formed over the entire circumference of the frame member, and the seal member is interposed over the entire circumference at the opposing locations.
In 5th invention, the opposing location of an outer periphery filter frame member and an outer periphery ring member is formed over the perimeter of a cylindrical frame member . A seal member is interposed at the opposite location.

Next, a filter device capable of being decomposed and cleaned according to a sixth invention is a filter device capable of being decomposed and cleaned according to any one of the first to fifth inventions, wherein a plurality of stock solution side chambers and filtrate solution side chambers are formed. And each stock solution inlet to the plurality of stock solution side chambers is communicated by the first communication means, and the filtrate outlet from the plurality of filtrate side chambers is communicated by the second communication means, A gas supply passage for supplying pressurized gas to the stock solution side chamber is provided.
In the sixth invention, a plurality of both the stock solution side chamber and the filtrate side chamber are assembled to form the frame member. The stock solution inlets formed in the stock solution side chamber are communicated with each other by the first communication means. The filtrate outlets formed in the filtrate side chamber are communicated with each other by the second communicating means. Further, the pressurized gas is supplied into the stock solution side chamber through the gas supply passage. In some cases, the gas in the stock solution side chamber can be discharged from the gas supply passage.

Next, the filter device capable of being decomposed and washed according to the seventh invention is a filter device capable of being decomposed and cleaned according to the sixth invention, wherein the filter device is placed, and the stock solution inlet and the filtrate outlet are positioned below. The gas supply passage is arranged at an upper position.
In the seventh invention, both the stock solution inlet and the filtrate outlet are arranged at a lower position of the filtration device in a state where the filtration device is placed. In the same state, a gas supply passage is disposed above the filtration device.

In addition to the above-described means, the filter device capable of being decomposed and cleaned according to the present invention may take the following means.
First, a disassembling and cleaning filter device according to a fifth aspect of the present invention, the facing portion of the outer peripheral ring member has a crank shape in cross section, and an end portion of a sheet-like filter material covering the filter surface of the filter screen member is disposed. A flange portion formed so as to protrude in the longitudinal direction of the cylindrical shape at least from the thickness of the sheet-like filter material, and the facing portion of the outer peripheral filter frame member has a cylindrical shape. A second part that presses the filter medium from the vertical direction to the first part, and a flange contact part that contacts the flange part from the cylindrical radial direction, and the contact part between the flange contact part and the flange part A seal member is disposed on the surface.
Furthermore, you may provide the groove part for accommodating a sealing member in either a flange site | part or a flange contact site | part.
Furthermore, the shape of the facing part of the outer peripheral filter frame member can be a shape corresponding to the shape of the facing part of the outer peripheral ring member.

Here, as a conventional example of a filtration device that feeds a stock solution between a filter plate with a filter medium and filters it with the indentation pressure, two opposing filter media are sandwiched between square filter plates There is. The filter medium is pressed against the square filter plate by ring-shaped packing disposed outside (Japanese Patent Laid-Open No. 2004-57921).
However, the above-described filtration apparatus has a problem that the filtrate that permeates the filter medium and leaks out. In particular, when the thickness of the filter medium was large, leakage of the filtrate was significant.

According to the above-described invention, the filter medium is pressed and fixed between the first part and the second part. And the sealing property of the frame member is ensured by arrange | positioning a sealing member in the contact part of a flange part and a flange contact part. That is, the close contact portion that ensures the sealing performance of the frame member and the pressing portion of the filter medium are different from each other. For this reason, permeation leakage from the filter medium can be prevented or reduced.
In addition, since the seal member is disposed between the flange portion and the flange contact portion formed so as to protrude in the length direction of the cylindrical shape rather than the thickness of the sheet-like filter material, even if the thickness of the filter material increases The sealability of the frame member can be ensured.
Further, the seal member can be accommodated in the groove portion to prevent or reduce the displacement of the seal member.
Moreover, by making the facing part of an outer periphery filter frame member and the facing part of an outer periphery ring member into a mutually corresponding shape, both can be engage | inserted and fixed.

  Next, a method for filtering a stock solution using a filter device capable of being decomposed and cleaned according to a seventh aspect of the present invention, wherein the filtration device is released from a sealed state, and a stock solution tank containing the stock solution and a stock solution inlet communicate with each other. The supply step of supplying the stock solution from the stock solution tank to the filtration device, the second passage and the first passage communicating both the filtrate outlet and the stock solution tank, and the stock solution side chamber and the filtrate side chamber. A circulation filtration step of circulating the stock solution in the order of the stock solution tank and the third passage and the first passage communicating both the filtrate tank and the filtrate outlet for containing the filtrate, and from the stock solution side chamber to the filtrate side chamber And a filtration step of feeding the stock solution to perform filtration, a third passage and a gas supply passage are opened, a gas is supplied in the order of the stock solution side chamber and the filtrate side chamber, and a residual filtration step of filtering the stock solution remaining in the filtration device And open the second passage and the gas supply passage. And air blow removing the residual stock in the cake, and the first passage and the gas supply passage is opened, and a pipe blowing step of removing the suspension in the first passage.

In the above-described invention, the frame member is filled with the stock solution in the supplying step, and the filtering operation is performed using the pressure at which the stock solution is poured into the frame member in the filtering step. Next, the undiluted solution at the time of the filtration process remaining in the frame member is filtered with a gas pressure in the residual filtration process.
In the air blowing process, the cake is drained using the pressure of the gas. Therefore, the stock solution between the cake particles and the filter medium can be drained.
Further, the stock solution in each passage is removed by a piping blow process. For this reason, the undiluted | stock solution and filtrate in a frame member and each channel | path are excluded, and the liquid leak at the time of filtration apparatus opening can be prevented or reduced.

Further, the second passage may be opened in advance during the in-pipe blowing process. By suppressing the pressure difference between the stock solution side chamber and the filtrate side chamber at the time of the in-pipe blowing process, it is possible to prevent or reduce the cake that has adhered to the filter screen member.
Furthermore, you may have the discharge process which open | releases the channel | path which connects a filtration apparatus and the exterior after an air blow process, and exhausts the gas in a filtration apparatus. By suppressing the pressure difference between the inside of the filtration device and the outside, the inflow and outflow of gas from the inside of the filtration device when the filtration device is opened can be prevented or reduced, and the filtration screen member itself can be made thin and lightweight.

According to the present invention described above, the following effects can be obtained.
First, according to the first invention, the filtrate side chamber is formed by two filter screen members that can be separated from the frame member independently while preventing filtrate leakage during filtration as much as possible. For this reason, when disassembling and washing the filtration device after the filtration operation is completed, each filtration screen member can be removed and washed for each filtration screen member.
Moreover, since it suppresses that the filter screen members which oppose are bent and deformed in the direction which mutually approaches, the failure | damage of the filter screen member by a bending deformation can be prevented or reduced.

  Next, according to the second invention, the filtrate side chamber is formed by the two filtration screen members and the ribs, which can be disassembled independently from the frame member. For this reason, each filter screen member and rib can be disassembled and cleaned.

Next, according to 3rd invention, since the rib which is a some plate-shaped member is arrange | positioned between each filtration screen member, the bending deformation of each filtration screen member can be suppressed more reliably.
Moreover, since the communicating path which connects the filtrate side chamber divided by each rib is formed, the distribution | circulation of the liquid or gas between filtrate side chambers is attained.
Next, according to the fourth aspect of the invention, the outer peripheral filter frame member and the outer peripheral ring member constituting the frame member are provided with the stock solution inlet and the filtrate outlet. Therefore, the structure of the frame member itself as compared with the case where they are provided inside the frame member yet is abbreviated.

Next, according to 5th invention, since the sealing member is interposed in the opposing location formed over the perimeter of an outer periphery filter frame member and an outer periphery ring member, the sealing property of the said location is ensured. Therefore, leakage of liquid / gas from the location is prevented or reduced. In particular, in a substantially cylindrical filter, a uniform sealing property can be obtained over the entire circumference.
Next, according to the sixth invention, since the stock solution inlets are communicated with each other by the communicating means, there is no pressure difference in each filtrate side chamber. Further, since the filtrate outlets communicate with each other by the communication means, there is no pressure difference in each stock solution side chamber. For this reason, it can prevent or reduce that a bending moment is applied to each member due to the pressure difference in the filtration device. Furthermore, it is possible to prevent or reduce the occurrence of a difference in the liquid level inside the frame member partitioned by each member (the amount of the stock solution and the filtrate shown by the height).
Moreover, since the gas supply passage is provided in the outer peripheral filter frame member, gas can be arbitrarily taken in and out of the filtration device.

  Next, according to the seventh invention, since the stock solution inlet is disposed at the lower position and the gas supply passage is disposed at the upper position, the air lighter than the stock solution is pushed upward, so that the stock solution and the air Can be easily replaced. Further, since the filtrate outlet is arranged at the lower position, the filtrate can be recovered more completely from the filtrate outlet by using gravity (that is, almost no filtrate remains inside).

The best mode for carrying out the present invention will be described below with reference to the drawings.
1 and 2 are views showing the entire filtering device, FIG. 3 is a cross-sectional view of the filtering device main body, FIGS. 4 to 16 are diagrams of each component, and FIG. 17 is a relationship diagram of the filtering device and its peripheral members. It is.
The filtration device 1 according to the present embodiment is for separating and recovering a filtrate and a cake by filtering a slurry generated in the process of producing liquid foods and pharmaceuticals. The slurry is filtered in the filtering device main body 2, the cake is held in the filtering device 1, and the clear filtrate is discharged to the outside of the filtering device 1.

The filtration device 1 according to the first embodiment includes a filtration device body 2 and a fixing member 3.
The fixing member 3 shown in FIGS. 1 and 2 includes a flat substrate 4, a column 5, and a rail member 6.
Four struts 5 are erected vertically at the four corners of the substrate 4 placed at the site where the filtration device 1 is to be attached. A long flat rail member 6 is bridged and attached to the two columns 5 and 5 arranged on both sides of the substrate 4. In FIG. 2, the handle member 7 is broken and the rail member 6 is exposed.
The cylindrical filtration device main body 2 is fixed to the rail member 6 via the handle member 7 so that the cylindrical end surface faces the front as viewed in FIG. A stock solution passage 11 and a filtrate passage 12 are provided at a lower position of the filter device body 2. Further, a gas supply passage 13 is provided at a position above the filtering device main body 2.

3 includes a frame member 10, a first filtration screen member 20 a, a second filtration screen member 20 b, and a closing member 30.
The frame member 10 forms a body portion of the filtration device main body 2. Inside the frame member 10, two sets of a first filtration screen member 20a and a second filtration screen member 20b that are arranged to face each other are accommodated. A plurality of later-described ribs 25 are bridged between the first filtration screen member 20a and the second filtration screen member 20b. A closing member 30 is disposed on both cylindrical end faces of the frame member 10.
Hereinafter, each component will be described.

[Frame body member]
The frame member 10 of FIG. 3 is a cylindrical member formed by assembling a plurality of outer ring members 40 and outer filter members 50. The outer peripheral ring member 40 and the outer peripheral filter frame member 50 are assembled together by fitting the outer peripheral portions thereof.
And the site | part enclosed by the outer periphery ring member 40, the below-mentioned 1st filtration screen member 20a, and the 2nd filtration screen member 20b becomes the filtrate side chamber 60. FIG.
Further, a portion surrounded by the outer filter frame member 50 and the filter screen members 20a, 20b, and 20c is a stock solution side chamber 70.
Furthermore, a substantially circular filter paper 15 is disposed on each of the filter screen members 20a and 20b so as to cover a surface (filter surface) over which the stock solution side chamber 70 is desired.

[Outer ring member]
The outer peripheral ring member 40 shown in FIGS. 4 to 7 is a short cylindrical member having both ends opened. A round bar member 43 is attached to the inner peripheral surface 40b of the outer peripheral ring member. An attachment seat 41 and a filtrate outlet 42 are attached to the outer peripheral surface 40a of the outer peripheral ring member. And the rib 25 mentioned later will be arrange | positioned in the position represented with the dotted line at the time of the assembly | attachment state.

The round bar member 43 in FIG. 4 is a member for attaching the filter screen members 20a and 20b described later to both opening ends of the outer peripheral ring member 40. The round bar member 43 is attached to the inner peripheral surface 40b of the outer peripheral ring member in a state where it stands facing the center of the outer peripheral ring member 40.
A total of eight round bar members 43 are attached to the outer ring member 40. That is, four round bar members 43 are arranged at one opening end portion of the outer peripheral ring member 40 shown in FIG. 4 while maintaining an angle of approximately 90 degrees. Further, four round bar members 43 are similarly arranged on the other opening end portion (not shown).

The mounting seat 41 is a member for fixing the outer peripheral ring member 40 to the rail member 6 in cooperation with the handle member 7 described above. The mounting seat 41 is a substantially rectangular member. Two mounting seats 41, 41 are mounted on the outer peripheral surface 40a of the outer peripheral ring member symmetrically as viewed in FIG.
The filtrate outlet 42 is a cylindrical pipe for collecting the filtrate. As shown in FIG. 5, one end of the filtrate outlet 42 opens in the filtrate side chamber 60. The other end of the filtrate outlet 42 is connected to the first connection passage 44.

The first connection passage 44 in FIG. 6 is a short cylindrical pipe connected perpendicularly to the filtrate outlet 42. The first connecting passage 44 is arranged so that both open ends face in the left-right direction as seen in the figure. One open end 44a of the first connection passage 44 has a wide inner periphery. The other open end 44b of the first connection passage 44 has a crank-shaped cross section and has an outer peripheral shape that fits into the one open end 44a.
A groove 44c for accommodating the O-ring 8a (see FIG. 3) is formed on a surface parallel to the inner peripheral surface of the first connection passage 44.
The first connection passage 44 in the assembled state is connected to another first connection passage 44 to form the above-described filtrate passage 12 (see FIG. 3).

The outer peripheral portion of the outer peripheral ring member 40 in FIG. 7 protrudes rightward as viewed in the same figure to form a flange portion 45 having a substantially crank-shaped cross section. The flange part 45 is a surface part (facing part) facing the staircase part 55 (see FIG. 10) described later in the assembled state.
The first surface 46 of the flange portion perpendicular to the inner peripheral surface 40b of the outer peripheral ring member is formed with a recess 46a for arranging the peripheral portions of the filter screen members 20a and 20b described later. Further, a pin 9 (see FIG. 3) for temporarily fixing (positioning) the filter paper 15 is provided on the first surface 46 of the flange portion.

A second surface 47 of the flange portion parallel to the inner peripheral surface 40b of the outer peripheral ring member is a portion facing a second surface 57 of a staircase portion described later and a seal member storage portion 59 (see FIG. 10). It is.
The second surface 47 of the flange portion is formed so as to protrude rightward as viewed in FIG. For this reason, even if the flange part 45 and the staircase part 55 are separated to some extent in the left-right direction as viewed in FIG. 7, the state in which the second surface 47 of the flange part and the seal member storage portion 59 face each other is maintained.

[Perimeter filter frame member]
The outer peripheral filter frame member 50 shown in FIGS. 8 to 10 is a cylindrical member having both ends opened. A mounting seat 41, a stock solution inlet 51, and a gas supply port 52 are provided on the outer peripheral surface 50 a of the outer peripheral filter frame member.

The stock solution inlet 51 is a cylindrical pipe for supplying the stock solution. As shown in FIG. 9, one end of the stock solution inlet 51 opens in the stock solution side chamber 70. The other end of the stock solution inlet 51 is connected to the second connection passage 53. The second connection passage 53 in the assembled state is connected to another second connection passage 53 to form the stock solution passage 11.
The gas supply port 52 in FIG. 8 is a cylindrical pipe for supplying gas. One end thereof opens in the stock solution side chamber 70, and the other end is connected to the third connection passage 54 (see FIG. 3). The third connection passage 54 in the assembled state is connected to another third connection passage 54 to form the gas supply passage 13 (see FIG. 3).
Since the mounting seat 41, the second connection passage 53, and the third connection passage 54 have the same configuration as the corresponding members of the outer peripheral ring member 40, the corresponding portions are denoted by the same reference numerals. Detailed description thereof will be omitted.

The outer peripheral partial cross section of the outer peripheral filter frame member 50 in FIG. 10 is recessed in the left direction as viewed in FIG. The staircase portion 55 is a surface location (facing location) facing the flange portion 45 described above in the assembled state.
The first surface 56 of the staircase portion perpendicular to the inner peripheral surface 50b of the outer peripheral ring member is a portion facing the first surface 46 of the flange portion described above when assembled. Further, a pin insertion hole 58 for inserting a pin 9 (see FIG. 3) for temporarily fixing (positioning) the filter paper 15 is provided on the first surface 56 of the staircase portion.

The connecting portion between the second surface 57 of the staircase portion parallel to the inner peripheral surface 50b of the outer peripheral ring member and the first surface 56 of the staircase portion has a substantially L-shaped cross section. This notched portion becomes a seal member storage portion 59 in which the O-ring 8 (see FIG. 3) is stored. The bottom surface portion 59a is inclined so that the O-ring 8 does not move in the left direction as viewed in FIG.
The second surface 47 of the flange portion described above corresponds to the “flange portion” according to the present invention, and the seal member storage portion 59 corresponds to the “flange contact portion” according to the present invention. The O-ring 8 corresponds to the “seal member” according to the present invention.

[Filtration screen member]
The first filter screen member 20a shown in FIGS. 11 to 13 and the second filter screen member 20b shown in FIG. 14 are front circular plate members. In addition, ten ribs 25 are coupled in parallel to the first filter screen member 20a at regular intervals.
In addition, a plurality of pores penetrating in the thickness direction are provided on the surfaces of the filtration screen members 20a and 20b. Furthermore, clasp members 21 are provided at four locations at the peripheral ends of the filter screen members 20a and 20b while maintaining an angle of approximately 90 degrees.

Each filter screen member 20a, 20b is fixed to the outer peripheral ring member 40 in a state in which the peripheral edge portion is disposed in the concave portion 46a formed in the first surface 46 of the flange portion described above.
The peripheral ends of the filter screen members 20a and 20b are slightly bent in the assembly direction of the filter screen members 20a and 20b. The peripheral end portion bends in the assembling direction when assembled. Using the rebound resilience against this deformation, the filter screen members 20a and 20b are elastically supported.

  The ribs 25 in FIGS. 12 and 13 are flat plate members. As shown in FIG. 13, each rib 25 is coupled to the first filter screen member 20a at one long side portion 25a. The rib 25 at the time of assembly is in contact with the second filtration screen member 20b at the other long side portion 25b. Further, communication passages 27, 27 having a predetermined distance dimension are formed between the short side portions 25c, 25c of the rib 25 and the inner peripheral surface 40b of the outer peripheral ring member.

15 and 16 is a flat plate member having a substantially crank-shaped cross section. As shown in FIG. 16, the central portion 21 a of the clasp member 21 is curved so as to sandwich the round bar member 43.
The clasp member 21 is welded and fixed to the filtration screen members 20a and 20b.

[Closed member]
The closing member 30 shown in FIG. 3 is a member (or a dish-shaped member) formed of a part of a spherical shell having a large pressure resistance with one end opened, and a filtrate outlet 32 of the closing member is provided on the outer periphery thereof. Yes. The filtrate outlet 32 of the closing member is connected to the connecting passage 33 at its end. The connecting passage 33 is connected to the adjacent first connecting passage 44 and becomes a part of the filtrate passage 12. Further, the connecting passage 36 constituting a part of the gas supply passage 13 is attached to the closing member 30 without communicating with the inside of the closing member 30.
Further, a third filtration screen member 20 c is fitted into the opening of the closing member 30.
As shown in FIG. 1, a plurality of ribs 35 arranged in a radial circle are coupled to the third filter screen member 20c. The filter paper 15 is also disposed on the filtration surface of the third filtration screen member 20c.
Since the filtrate outlet 32 of the closing member and the connecting passages 33 and 36 have the same configuration as the corresponding member of the outer peripheral ring member 40, the corresponding portions are denoted by the same reference numerals and detailed description thereof is omitted. To do.
In the present embodiment, the filtering operation is also performed in the closing member 30, but it is not always necessary to have a filtering function.

[Assembly method]
First, the filtration surface disposed outside the filtration screen members 20a and 20b is covered with the filter paper 15 (see FIG. 3). The peripheral end of the filter paper 15 is disposed on the first surface 46 of the flange portion. In order to fix the filter paper 15 in this state, the filter paper 15 is inserted into the pin 9. Alternatively, the filter paper 15 may be wetted with water or the like without installing the pin 9, and the filter screen members 20a and 20b and the filter paper 15 may be bonded together. The end portion of the pin 9 is accommodated in the pin insertion hole 58 of the outer peripheral filter frame member 50.
Then, the assembled outer ring member 40 is attached to the rail member 6 and moved on the rail member 6 in the direction in which the outer ring member 40 is housed in the fixed member 3 (rightward as viewed in FIG. 2).
The closing member 30 is stored in the fixing member 3 in advance by the same method.

Next, the O-ring 8 is stored in the seal member storage portion 59 of the outer filter frame member 50. In this state, the outer perimeter filter frame member 50 is attached to the rail member 6 and is moved in the direction in which it is accommodated in the fixing member 3 (rightward as viewed in FIG. 2).
And the flange part 45 of the outer periphery ring member 40 and the step part 55 of the outer periphery filter frame member 50 fit each other, and both are assembled | attached.
At this time, the first surface 56 of the staircase portion presses the peripheral end portion of the filter paper 15 against the first surface 46 of the flange portion. Further, the O-ring 8 is disposed between the second surface 47 of the flange portion and the seal member storage portion 59.
Then, the filtration device 1 is assembled by further storing the closing member 30. The peripheral portion of the closing member 30 is fixed to the outer peripheral filter frame member 50 with a plurality of bolts 37 as shown in FIG.

[Operation and effect of filtration device 1]
First, the filtrate side chamber 60 is formed by the first filtration screen member 20a and the second filtration screen member 20b that can be independently detached from the outer peripheral ring member 40. For this reason, when the filter apparatus 1 is disassembled and cleaned, the filter screen members 20a and 20b can be removed and cleaned for each filter screen member 20a and 20b.
Further, the two filtration screen members 20a and 20b are arranged to face each other and the inside thereof is used as the filtrate side chamber 60, so that the filtration is performed as compared with the case where the filtration screen members are stacked and filtered from one direction. The area is doubled. That is, each of the filtration screen members 20a and 20b contributes to the filtration work. For this reason, there are few parts which do not contribute to filtration, and the maintainability of the filtration apparatus 1 improves.

Next, a rib 25 is disposed to prevent the first filter screen member 20a and the second filter screen member 20b facing each other from being bent and deformed in a direction approaching each other. For this reason, the damage by the bending deformation of each filtration screen member 20a, 20b can be prevented.
Further, since the communication passages 27 and 27 communicating with the filtrate side chamber 60 divided by the ribs 25 are formed, the liquid / gas can be circulated between the filtrate side chambers 60. For this reason, it can discharge from one place. That is, the inside of the filtrate side chamber 60 is regarded as a simple space, which can be easily manufactured and easily cleaned.

Next, the substantially cylindrical filtration device 1 has no corners, and the assembly work is facilitated. In addition, the cylindrical filtering device 1 can be processed with higher accuracy than a polygonal cylindrical body.
Further, the flange portion 45 of the outer peripheral ring member 40 and the stepped portion 55 of the outer peripheral filter frame member 50 are fitted to each other, and the filter paper 15 is pressed by the first surface 56 of the stepped portion. For this reason, compared with the case where presser fittings, such as a screw, are used for attachment of the filter paper 15, the number of parts required for the assembly decreases.
A stock solution inlet 51 is provided in the outer peripheral filter frame member 50 constituting the frame member 10. The outer peripheral ring member 40 is provided with a filtrate outlet 42 and a gas supply passage 13. For this reason, it is not necessary to provide them in each filtration screen member 20a, 20b, and the structure of each filtration screen member 20a, 20b itself can be simplified.

  Next, since the filtrate outlets 42 are communicated with each other through the connection passage 44, a pressure difference in each filtrate side chamber 60 does not occur. Further, since the stock solution inlets 51 are communicated with each other by the connecting passage 53, a pressure difference in each stock solution side chamber 70 does not occur. For this reason, it can prevent or reduce that a difference arises in the liquid level inside frame member 10 partitioned by each member. Furthermore, it is possible to prevent or reduce the bending moment from being applied to each member due to the pressure difference in the filtration device 1. In particular, the indentation pressure applied to the first filtration screen member 20a and the second filtration screen member 20b facing each other is also equal, so that no bending moment is applied to the rib 25. Therefore, the rib 25 can be reduced in weight without considering the bending moment.

  Next, since the stock solution inlet 51 is disposed on the lower side, the slurry and the air can be easily replaced by extruding air from the lower side to the upper side. Further, since the gas supply passage 13 is disposed on the upper side and the filtrate outlet 42 is disposed on the lower side, the filtrate can be recovered from the filtrate outlet 42 by utilizing gravity (gas pressure).

Next, the seal member housing portion 59 that houses the O-ring 8 and the second surface 47 of the flange portion are formed over all the fitting locations of the outer ring member 40 and the outer filter frame member 50. For this reason, the sealing property of a fitting part is ensured and the leak of a liquid and gas can be prevented or reduced. In particular, in the substantially cylindrical filtration device 1, a uniform seal pressure distribution can be obtained over the entire circumference.
Further, the close contact portion for ensuring the sealing property of the frame member 10 and the pressing portion of the filter paper 15 are different portions. For this reason, there is no permeation leakage of the filtrate from the filter paper 15.
Further, even when filter papers 15 having different thicknesses are used as necessary, the facing state between the seal member storage portion 59 and the second surface 47 of the flange portion is maintained, so that the sealing between the portion surfaces is maintained. Is secured. In this case, the sealing property of the connecting portion of each connecting passage 44 (33, 36, 53, 54) is similarly secured. This is because the connecting portion of each connecting passage 44 (33, 36, 53, 54) is maintained in the facing state by the same configuration.

[Filtration method]
The filtration method includes seven steps including a supply step, a circulation step, a filtration step, a residual filtration step, an air blow step, an in-pipe blow step, and an exhaust step.

First, the relationship between the filtering device 1 and each peripheral member will be described with reference to FIG.
The stock solution passage 11 communicates with a stock solution tank 80 for storing slurry through a first pipe 81. A filtration pump 82 for sending slurry from the stock solution tank 80 into the filtration device 1 and a bypass valve 83 for adjusting the flow rate are attached to the first pipe 81.
The filtrate passage 12 communicates with the stock solution tank 80 through the second pipe 86. The filtrate passage 12 also communicates with a filtrate tank 85 that stores the filtrate through a third pipe 87.
The gas supply passage 13 communicates with the stock solution tank 80 through the vent pipe 88.
The gas supply passage 13 communicates with a gas supply device (not shown) for supplying gas through a fourth pipe 89. The gas supplied from the gas supply device is air or an inert gas such as nitrogen.

In addition, bidirectional valves 90a, 90b, 90c, 90d, and 90e that can circulate liquid bidirectionally are attached to the pipes 81, 86, 87, 88, and 89, respectively. The bypass valve 83 also has a configuration that allows liquid to flow in both directions.
The members communicating with the pipes 81, 86, 87, 88, 89 do not specify or limit the purpose / function of the pipes 81, 86, 87, 88, 89. For example, the vent pipe 88 may serve purposes and functions such as gas discharge, pressurized gas supply, and stock solution circulation.

(Supply process)
First, the bidirectional valve 90d is opened, the vent pipe 88 is opened, and the sealing state of the filtration device 1 is released. Next, the bidirectional valve 90a is opened to open the first pipe 81. Then, the filtration pump 82 is started and the slurry is put into the filtration device 1 through the stock solution passage 11. The slurry is filled inside while pushing the air in the stock solution side chamber 70 out of the vent pipe 88. The slurry overflowing from the stock solution side chamber 70 returns to the stock solution tank 80 again through the vent pipe 88.
The two-way valve 90b may be opened to open the second pipe 86, and the sealing state of the filtration device 1 may be released.

(Circulating filtration process)
Next, the bidirectional valve 90a is opened to open the first pipe 81. Further, the bidirectional valve 90b is opened to open the second pipe 86. Then, the slurry is circulated using the filtration pump 82 in the order of the stock solution side chamber 70, the filtrate solution side chamber 60, and the stock solution tank 80. Note that this step may be omitted if the filter paper 15 has the required filtration accuracy.
Here, when the slurry containing particles having a large sedimentation property (sedimentation rate) is filtered, it is desirable to open the vent pipe 88 by opening the bidirectional valve 90d. By giving the slurry in the stock solution side chamber 70 an upward movement as seen in FIG. 17, sedimentation of the particles in the stock solution side chamber 70 can be suppressed. By keeping the density of the particles in the slurry uniform, a cake having a uniform thickness can be formed on the surface of the filter paper 15 (see FIG. 3) in the filtration step described later.

(Filtering process)
Next, the bidirectional valve 90a is opened to open the first pipe 81. Further, the bidirectional valve 90c is opened to open the third pipe 87. Then, the slurry is fed from the stock solution side chamber 70 to the filtrate side chamber 60 using the filtration pump 82. The fed slurry moves in the order of the stock solution side chamber 70, the filter paper 15, the filter screen member 20a (20b), and the filtrate side chamber 60 to become a clear filtrate. Then, it passes through the third pipe 87 and is collected into the filtrate tank 85.
In addition, when filtering the slurry containing a particle group with a large sedimentation property (sedimentation speed), it is desirable to open the vent pipe 88 by opening the bidirectional valve 90d for the reason described above.

(Residual filtration step)
Next, the bidirectional valve 90c is opened to open the third pipe 87. Further, the bidirectional valve 90e is opened to open the fourth pipe 89. Then, gas is supplied in the order of the stock solution side chamber 70, the filtrate side chamber 60, and the filtrate tank 85. The stock solution remaining in all the stock solution side chambers 70 is filtered and collected.
Further, the liquid levels in the filtrate side chamber 60 and the stock solution side chamber 70 are constantly balanced and constant, and the filtration operation proceeds in each side chamber almost simultaneously. Therefore, only the stock solution in a part of the stock solution side chamber 70 is not discharged (blowed), and the stock solution does not remain in the remaining stock solution side chamber 70.

(Air blow process)
Next, the bidirectional valve 90b is opened to open the second pipe 86. Further, the bidirectional valve 90e is opened to open the fourth pipe 89. And gas is supplied in order of the stock solution side chamber 70, the filtrate side chamber 60, and the filtrate tank 80, and an airflow is generated. By this process, the cake and the filter paper 15 can be drained by removing the slurry remaining between the particles in the cake and the slurry remaining on the filter paper 15. Further, the filtrate in the second pipe 86 can be returned to the stock solution tank 80 by an air flow.
(Blowing process in piping)
Next, the bidirectional valve 90a and the bypass valve 83 are opened to open the first pipe 81. Further, the bidirectional valve 90e is opened to open the fourth pipe 89. And the slurry in the 1st piping 81 is returned in the stock solution tank 80 by gas pressure.
At this time, it is desirable to open the second pipe 86 in advance by opening the bidirectional valve 90b. By suppressing the pressure (back pressure) in the filtrate side chamber 60, it is possible to prevent or reduce the cake on the surface of the filter paper 15 from collapsing toward the stock solution side chamber 70 side.
If the circulation filtration step is omitted, the third pipe 87 may be opened instead of the second pipe 86.
(Exhaust process)
Finally, the bidirectional valve 90d is opened to open the vent pipe 88. And after exhausting the gas in the filtration apparatus 1, the filtration apparatus 1 is open | released.

[Operation and effect of filtration method]
First, more filtrate in the filtration device 1 can be recovered by the residual filtration step. Since the stock solution inlet 51 is communicated with the lower portion, the remaining solution is uniformly filtered in all the stock solution side chambers 70.
Further, since the slurry and the filter paper 15 are drained by the air blowing process and the slurry or filtrate in each of the pipes 81, 86, 87, 88, 89 is excluded, liquid leakage when the filtration device 1 is opened can be prevented or reduced.

[Other embodiments]
The filtration device 1 according to the present invention is not limited to the above-described embodiment, and may take other various embodiments.
First, the first filter screen member 20a, the second filter screen member 20b, and the rib 25 may be separate members. If they are separate members, the filter screen members 20a and 20b and the ribs 25 can be removed and cleaned when the filter device 1 is disassembled and cleaned. In this case, the rib 25 is fitted and fixed in the groove structure provided on the inner peripheral surface 40b of the outer peripheral ring member. A plurality of ribs 25 may be connected. For example, a rod member may be bridged between the plurality of ribs 25. Moreover, if it is a cross rib which ribs crossed orthogonally, it can be handled as one member. The outer peripheral ring member 40 and the rib 25 may be integrated.
Next, the seal member storage portion 59 may be provided with a groove portion having the same configuration as the groove portion 44c shown in FIG. The opening portion of the groove portion may be tightened so that the seal member does not move in the removal direction. The storage portion may be provided either inside or outside.

Next, the attachment method of the 1st filtration screen member 20a, the 2nd filtration screen member 20b, and the outer periphery ring member 40 can take various means.
For example, a spring member such as a leaf spring member or a coil spring may be attached to the outer ring member 40. The spring member is given an elastic force that presses the outer peripheral surface of each of the filtration screen members 20a and 20b in the radial direction in the assembled state.
Further, the outer ring member 40 may be provided with an attachment member having a substantially U-shaped cross section. The mounting member is mounted at the position of the round bar member 43 so that the opening faces the inner peripheral surface. Each filtration screen member 20a, 20b is provided with a mounted member having a substantially L-shaped cross section. The attached member is attached at the position of the clasp member 21 so that the free end thereof faces radially outward. And each filtration screen member 20a, 20b and the outer periphery ring member 40 are fixed by inserting the free end of a to-be-attached member in the opening part of an attachment member.
Various known methods such as screwing and rib 25 fixing can also be applied.

Next, the first filter screen member 20a and the second filter screen member 20b can take various shapes such as a perforated plate, a wire mesh shape, and a wedge wire.
The shape of the rib 25 can take various shapes such as a flat plate, a round bar, a square bar, and a pipe. Further, the ribs 25 may be arranged in any arrangement state such as a cross beam, a radial shape or a concentric shape. The number of ribs 25 can also be changed as appropriate.
Further, the short side portions 25c and 25c of the rib 25 may be in contact with the inner peripheral surface 40b of the outer peripheral ring member. In this case, the side portions 25c, 25c on the short side of the rib 25 are notched in the radial direction of the outer peripheral ring member 40, and this notched portion serves as a communication path. The shape of the notch can be a semi-elliptical shape, a semi-circular shape, a polygonal shape or the like when viewed from the front of FIG. The cutout portion may be formed by vertically cutting the long side portion 25a (25b) of the rib 25 in FIG. The position where the cutout portion is provided in the long side portion 25a (25b) may be any position such as a center position or an end position as viewed in FIG. Moreover, you may provide the hole penetrated in the thickness direction of the rib 25 instead of a notch part.
Further, as a sealing material, known sealing materials such as various packings and lip seals can be used.
Further, a filter material using a known material such as cellulose can be used as the filter paper 15. In addition to the filter paper 15, a known filter cloth or the like can be used as the “filter material” according to the present invention. Furthermore, the filtration screen member 20a (20b) and the “filter material” according to the present invention may be integrated. For example, a sintered wire mesh can be used as the “filter material” according to the present invention. This sintered wire mesh may be welded to the filtration screen member 20a (20b).

  Next, the arrangement positions of the stock solution inlet 51 and the filtrate outlet 42 can be changed as appropriate. For example, the filtrate outlet 42 may be attached to the upper position of the filtration device 1 as seen in FIG. A pipe opened near the bottom surface inside the filtration device 1 can be communicated with the filtrate outlet 42, and the filtrate can be discharged outside through the pipe using the gas pressure.

It is a front fragmentary sectional view of a filtration apparatus. It is a side view of a filtration apparatus. It is sectional drawing of a filter apparatus main body. It is a front view of an outer periphery ring member. It is the VV sectional view taken on the line of FIG. It is sectional drawing of a connection channel | path. It is sectional drawing of the outer peripheral part of an outer periphery ring member. It is a front view of an outer periphery filter frame member. It is sectional drawing of the IX-IX line of FIG. It is sectional drawing of the outer peripheral part of an outer periphery filter frame member. It is a front view of a filtration screen member. It is a cross-sectional view of the filtration screen member of FIG. It is a longitudinal cross-sectional view of the filtration screen member of FIG. It is sectional drawing of another example of the filtration screen member. It is a front view of a clasp member. It is sectional drawing of a clasp member. It is a related figure of a filtration apparatus and its peripheral member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Filtration apparatus 2 Filtration apparatus main body 3 Fixing member 4 Board | substrate 5 Support | pillar 6 Rail member 7 Handle member 8, 8a O-ring 9 Pin 10 Frame member 11 Stock solution passage 12 Filtration passage 13 Gas supply passage 15 Filter paper 20a First filtration screen member 20b Second filter screen member 20c Third filter screen member 21 Clasp member 21a Central portion 25, 35 Rib 25a One long side 25b The other long side 25c Short side 27 Communication passage 30 Closing member 32 Filtrate outlet 33, 36 Closing member 37 Connection passage 37 Bolt 40 Outer ring member 40a Outer ring surface 40b Outer ring member inner face 41 Mounting seat 42 Filtrate outlet 43 Round bar member 44 Connecting path 44a One open end 44b The other open end 44c Groove 45 Flange part 46 Flange part first surface 47 The second surface 46a of the peripheral portion 46, the recess 50, the outer peripheral filter frame member 50a, the outer peripheral surface 50b of the outer peripheral filter frame member, the inner peripheral surface 51 of the outer peripheral filter frame member, the stock solution inlet 52, the gas supply port 53, the second connection passage 54, and the third connection passage. 55 Staircase portion 56 First surface 57 of staircase portion 58 Second surface 58 of staircase portion Pin insertion hole 59 Seal member storage portion 59a Bottom surface portion 60 of seal member storage portion Filtrate side chamber 70 Stock solution side chamber 80 Stock solution tank 81 First Pipe 82 Filtration pump 83 Bypass valve 85 Filtrate tank 86 Second pipe 87 Third pipe 88 Vent pipe 89 Fourth pipe 90a, 90b, 90c, 90d, 90e Bidirectional valve

Claims (7)

The inside of the filter screen member is formed as a filtrate side chamber by two filter screen members spaced apart in a chamber defined and sealed by a cylindrical frame member, and the filter screen The outside between the members is partitioned and formed as a stock solution side chamber, and the frame member is provided with a stock solution inlet for supplying the filtrate stock solution to the stock solution side chamber and a filtrate outlet for discharging the filtrate of the filtrate side chamber. An end of the filtration screen member is attached, and the filtration apparatus is configured to filter the filtrate stock solution supplied to the stock solution side chamber through the filter screen member and take out the filtrate into the filtrate side chamber,
A rib is provided between the two filter screen members forming the filtrate side chamber, and
The two filtration screen members forming the filtrate side chamber are assembled to the frame member as being disassembled independently from the frame member, and can be cleaned independently at the time of disassembly ,
The frame member is composed of an outer peripheral filter frame member that defines an outer periphery of the stock solution side chamber, and an outer peripheral ring member that defines an outer periphery of the filtrate side chamber,
Either one of the outer peripheral filter frame member and the outer peripheral ring member has a first portion where an end of the filter medium covering the filter surface of the filter screen member is disposed, and a thickness of the filter medium disposed. A flange portion formed so as to protrude in the length direction of the cylindrical shape, the other is a second portion that presses the filter medium against the first portion from the length direction of the cylindrical shape, and the cylindrical shape A filter device capable of being disassembled and cleaned, comprising a flange portion and a flange abutting portion that abuts through a seal member from a radial direction . A filter device capable of being disassembled and washed according to claim 1,
The filter device capable of being disassembled and cleaned, wherein the two filter screen members and the rib are formed so as to be assembled as separate members that can be disassembled. A filter device capable of being disassembled and washed according to claim 1 or 2,
The rib is formed of a plurality of plate-like members that divide the filtrate side chamber, and the rib of the plate-like member is formed with a communication passage that communicates the divided chamber, and can be disassembled and cleaned. Filtration device. A filter device capable of being decomposed and cleaned according to any one of claims 1 to 3 ,
Decomposition washable filtration device, characterized in that the filtrate outlet is provided on the peripheral ring member together with the stock solution inlet to the outer periphery濾枠member. A filter device capable of being decomposed and cleaned according to any one of claims 1 to 4 ,
The flange part and the flange contact part are formed with a cylindrical-shaped opposing part in the radial direction over the entire circumference of the frame member ,
A filter device capable of being disassembled and cleaned, wherein a seal member is interposed over the entire circumference at the opposite location. A filter device capable of being decomposed and cleaned according to any one of claims 1 to 5,
A plurality of the stock solution side chambers and the filtrate side chambers are formed, each stock solution inlet to the plurality of stock solution side chambers is communicated by a first communicating means, and a filtrate outlet from the plurality of filtrate side chambers is a second. The communication means of
A gas supply passage for supplying pressurized gas to the stock solution side chamber is provided in the stock solution side chamber. A filter device capable of being disassembled and cleaned according to claim 6,
In a state where the filtration device is mounted, the raw solution inlet and the filtrate outlet are disposed at a lower position, and the gas supply passage is disposed at an upper position, and the filter device capable of being decomposed and cleaned.

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